Using dot caused jinja to fail if the tag contained
characters such as '-' or spaces.

Currently results in a traceback when the command fails.

Ideally we should actually log stderr, since in most apps
that's where the errors go when something goes wrong.

This helps to fix issue #121

Signed-off-by: Julien Danjou <julien@danjou.info>

Added import-path= option
  - Allow user to define import paths for less compiler
Improved resource handling
  - Do not replace imports if resource uses_template option is False
  - Skip resources with `parse` meta option set to False (helpful to
    avoid parsing of helper less lib files)

Added a dict like `get` method to Expando class

-   `include_file_patterns` property accepts globs to filter by file name.
 -   `include_paths` accepts paths relative to content.
 -   `begin_node` and `node_complete` honor `include_paths`
 -   `begin_text_resource`, `text_resource_complete`, `begin_binary_resource`
      and `binary_resource_complete` honor both.

- Moved plugin_name property from CLTransformer to the base class (Plugin)

* Archives are generated in begin_site to honour meta data
* Archives are first class resources
* Archive configuration now accepts an additional meta parameter
* The default nodemeta property now points to meta.yaml

* Ignores .hg, .svn, .git by default
* Additional nodes can be ignored by adding to site.config.ignore

* You can add a publisher with `default` as the name
* If no publisher named `default` is found, one of the publishers will be used by default(non deterministic order)
* If neither of the above results in something useable, an error is raised

This is very handy in Unix world as most applications have standard
installation paths and standard command-line names. Hence, we can now
use those plugins without altering the site.yaml file at all.

Includes the patch by Brian Mattern that fixes menu to work in all
situations. Also adds the explanation how to use media_url and
base_url properties.